Imported an Alembic animation to Blender. How can i time-reverse it?
Related:

looping alembic
start alembic at specific frame

(e.g.) My alembic animation has a length of 240 frames.

Select all the objects, which were created on alembic import and go to the constraints or modifiers [properties tab].
Hold ⎇ Alt and  LMB click Override Frame.
Then ⎇ Alt LMB into the Frame field and type # 240 - frame.

A driver will be created for the Frame field and the field will turn purple.
Holding the ⎇ Alt key ensures, that this happens in all the modifiers and constraints of all the selected objects. You can confirm this, by individually selecting the other objects and double-check that their Frame field of the Cache Modifier and Cache Constraint is also purple.